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[MMUSIC] ICE-SIP-SDP: Question on ice-pacing attribute

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 17 July 2019 14:03 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "mmusic@ietf.org" <mmusic@ietf.org>
CC: "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>
Thread-Topic: ICE-SIP-SDP: Question on ice-pacing attribute
Thread-Index: AQHVPKhTYvk/K01+fEqTd3w2WIiQUg==
Date: Wed, 17 Jul 2019 14:02:53 +0000
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Subject: [MMUSIC] ICE-SIP-SDP: Question on ice-pacing attribute
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Hi,

I have a couple of questions on the ice-pacing attribute. For some reason I have missed this earlier:

Q1:

Section 4.5 says:

   “Following the procedures defined in [RFC8445], a default value of
   50ms is used for an agent when the ice-pacing attribute is omitted in
   the offer or the answer.

   The same rule applies for ice-pacing attribute values lower than
   50ms.  This mandates that, if an agent includes the ice-pacing
   attribute, its value MUST be greater than 50ms or else a value of
   50ms is considered by default for that agent.”

I don’t understand the “the same rule applies” text. What rule? 8445 does not forbid values lower than 50 ms – it only defines 50 ms as the default value.


Q2:

The attribute is not mentioned in the offer/answer procedures, so it is unclear whether:


  *   It can be modified during the session
  *   Whether it should be included in subsequent offers/answers

Before I suggest text, my question is: do we allow modifying the pacing mid-session?


Regards,

Christer

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